1161642580 has 48 divisors (see below), whose sum is σ = 2795425920. Its totient is φ = 397208448.

The previous prime is 1161642557. The next prime is 1161642613. The reversal of 1161642580 is 852461611.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42114 + ... + 64006.

It is an arithmetic number, because the mean of its divisors is an integer number (58238040).

Almost surely, 2^1161642580 is an apocalyptic number.

1161642580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1161642580 is an abundant number, since it is smaller than the sum of its proper divisors (1633783340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1161642580 is a wasteful number, since it uses less digits than its factorization.

1161642580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22288 (or 22286 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 1161642580 is about 34082.8781061694. The cubic root of 1161642580 is about 1051.2132853276.

The spelling of 1161642580 in words is "one billion, one hundred sixty-one million, six hundred forty-two thousand, five hundred eighty".